General Relativity (GR) was born more than a century ago and is still used for describing the gravitational field and geometry of spacetime [1]}. The theory has been extensively explored in the weak field regime, such as in solar system experiments and radio pulsars observations [2]}, [3]}, [4]}, [5]}. There are many theoretical models that make the same prediction as general relativity in the weak field regime but they deviate in strong field regimes. The strong field regime can be either studied with gravitational waves (GWs) or with electromagnetic radiation. Dynamical systems have a signature on GW but an electromagnetic radiation method can be studied when spacetime is static. Effects such as the deviation from geodesics motion can be studied by electromagnetic radiation-related methods.
